Reassembly - Hitachi DH 25PA Technical Data And Service Manual

9-2. Reassembly

Perform reassembly in the reverse order of disassembly while observing the given precautions and taking care of
the following points.
(1) Lubrication
Apply special grease to the following portions.
Both holes of the Connecting Rod [9] <9>
Inside of the Cylinder [2] <2> and the Piston Pin [8] <8>
Piston [7] <7>, outer circumference of the Striker [3] <3> and the O-Rings [4] <4>, [6] <6>
Outer circumference of the Second Hammer [19] <19>
O-Rings [18] <18>, [20] <20> for Retainer Sleeve [15] <15> and the O-Ring (D) [17] <17>
Lip portion of the Oil Seal [21] <21>
Fill 20 g of special grease in the Cylinder Case [31] <31> and 17.5 g of special grease in the Crank Case [46]
<46>. Fill 60 g of power tool grease No. 29 in the Gear Cover [54] <57>.
* Apply power tool grease No. 29 to the Steel Balls [14] <14>, [39] <39>, <48> and <72>, and Needle [16]
<16> to make reassembly work easier.
(2) Mounting the First Gear (DH 25PB only)
Insert the Clutch Spring <53> and the Clutch Shaft <54> (from the constricted side) into the hole of the Crank
Shaft <47>. Apply power tool grease No. 29 to the side hole of the crank shaft and then insert the Steel Ball
D4.76 <48>. Insert a steel bar of about 10 mm diameter having flat ends into the First Gear <51>. Pressing
the Clutch Shaft <54> so that the end surface becomes level with the end surface of the Crank Shaft <47>,
push in the First Gear <51> adjusting the first gear groove to the steel ball position.
(3) Mounting of Oil Seal [21] <21>
Prior to reassembly, apply grease to the inner circumference of the Oil Seal [21] <21>.
However, do not apply grease to its outer circumference. Also, when press-fitting the Oil Seal [21] <21>,
ensure that it is straight and level.
(4) Screw Locking Agent TB1401
Apply screw locking agent TB1401 to all hexagon socket head bolts and the Seal Lock Screw (W/Washers)
M5 x 25 [77] <87> prior to reassembly.
--- 24 ---